+ B test voltage is 0V, the output pipe disconnected Q302 collector measuring the voltage remains 0V, check the power supply circuit found Q605, Q606 reason for the breakdown voltage + B is generally high, this time should L606 16V power supply circuit breaker On to prevent high voltage amplifier circuit burned. The 605, Q606 welded, the instant test found positive terminal C616 + B voltage up to 200V, when changing C610 47uf/25V after electrolysis voltage is normal Note: encountered Q605, Q606 breakdown

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